<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: LowerCase.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Filter_StringToLower
 */
require_once 'Zend/Filter/StringToLower.php';

/**
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_File_LowerCase extends Zend_Filter_StringToLower {
	/**
	 * Adds options to the filter at initiation
	 *
	 * @param string $options
	 */
	public function __construct($options = null) {
		if (! empty ( $options )) {
			$this->setEncoding ( $options );
		}
	}
	
	/**
	 * Defined by Zend_Filter_Interface
	 *
	 * Does a lowercase on the content of the given file
	 *
	 * @param  string $value Full path of file to change
	 * @return string The given $value
	 * @throws Zend_Filter_Exception
	 */
	public function filter($value) {
		if (! file_exists ( $value )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "File '$value' not found" );
		}
		
		if (! is_writable ( $value )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "File '$value' is not writable" );
		}
		
		$content = file_get_contents ( $value );
		if (! $content) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Problem while reading file '$value'" );
		}
		
		$content = parent::filter ( $content );
		$result = file_put_contents ( $value, $content );
		
		if (! $result) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Problem while writing file '$value'" );
		}
		
		return $value;
	}
}
